Process and contrivance for production particularly of sugar-crystals in vacuum.



0. FROMM & M. SGHODLY.

PROCESS AND GONTRIVANOE FOR PRODUCTION PARTICULARLY 0F SUGAR CRYSTALS INVACUUM. APPLIOATION PILEDDEO. 10, 1912.

1,066,397 Patented July 1, 1913.

L-- H 1 V J) z B Trifle/272713:

UNITED scrarns PATENT OFFICE.

TTO EROMM, AfND MATHIAS SCHODLY, OF SCHWARTAU, NEAR Ll' ElBEGK, GERMANY.

PROCES$ AND GQNTRIVANCE F03, PRODUCTIQN PARTICULARLY SUGAR-CRYSTALS INVACUUM.

Patented July1,1913.

Application filed December 10,.1591-2. Serialiblo. 736,032..

To all whom it may concern:

Be it known that we, O'r'ro FROM-M- and MGMATHEIAS SorroDLY, subjects ofthe German- II" with the usual vacuum apparatus the syrup was boileduntil concentrated for the forma tion. of grains. The turning out ofcrystals of an equal size was however very difiicult, because theprocess can only be carried out so long as the apparatus is in cookingopera tion, whereupon on the stopping of the vacuum, must be emptied orfilled up. Now

as a rule the emptyingof the apparatus 00- curs exactly at the time ofthe grain formation, so that only a proportionally small grain isproduced. The mass or finished boiling is now conducted in a. mash inwhich it rests for some days, the so called crystallizing out, and forthe purpose of separation of the syrup fom the sugar crystals-it is putinto a centrifugal machine.

The above given working process loses time and heat and requires for itstechnical execution'large apparatus and produces only a proportionallysmall ain, because the increasing of the same 1s interrupted anddisturbed before being finished, during the periodic filling of theapparatus.

' The new workin process, according to the invention herewit 1 developsan uninterrupted production of the sugar crystals, which only arrivethen to be thrown oif when they have reached an equal volume, durinwhich the small crystals are thrown back into .the apparatus for furthergrowing. In order to be able to carry out this technically, a specialinstallation is neces sary, an exam le of which is represented, in thesketch an shows:

Figure 1. a side view and Fig. 2. a plan, both views show part sections.

A is the vacuum a paratus in which are one or more heaters in the lastcase they .canbe arranged above one another or :against one another. Inthe under conical part of the apparatus A is led a tube conductor B,which is connected with an exhaust and pressure pump F, and whichcarries a drainingcock G, as well as a valve D. l From the pump F is leda further tube B into a reservoir: E built in the upper part of theapparatus A, inwhich is laid out an inclined sievedv gutter H, in whichis provided a conical helical gear J. At the end of the reservoir E inthe lower part of the draining apparatus is fitted a gutter-pipe, Gwhich is provided with a suitable valve.

a The mode of operation of the. arrangement as described, is as follows:The solution containing sugar as syrup or so on, isdelivered through aninlet A into the evaporator A, which, with its combined tube conductorsB, B and G and the reservoir E are junder a Vacuum. The cooking of thesolution next follows as in every other vacuum apparatus until the sameis evaporated andthe small crystals appear. To this mass, whichcommences to cook, is then added a further quantity of solution untilthe size of 'the sugar crystals increases, and till a great quantity ofcrystals is stored in lower part of the apparatus A.

The useful effect of the apparatus can be increased thereby and theduration of the operation be shortened, if several burners are fittedabove one another in the apparatus in order to have the great-estpossible evaporating surface and to reach an equalization of temperaturebetween hot steam and the mass being treated.

If the mass is now fully cooked and under the action of the newly addeddiluted solution great numbers of crystals willhave settled on thealready steamed mass, then the valve D is opened and the thick mass, asfar as the same has entered into the crys tallizing state, is suckedthrough the, tube conductor B by means of the pump and always undervacuum, drawn through the pipe B into the reservoir E. The mass which iscomposed of small and lar e grains as well as molten liquor brought withsame, now falls into the sieved .gutter H where it is held by thehelical gear J and is transported in the rising gutter H under,theinfiuence of the sugar/solution, water and so on, and the steam risingfrom the apparatus. Now with this ,.transportation the fine crystalsbecolne separated from the mass and return through the sieved gutter Hinto the apparatus for further increasing, while the large crystals onthe end of the gutter get into the gutter pipe G and from here are ledfor further working in the known manner in the mash, centrifugalmachine, etc. Through the circulation with the mass of not yet fullyformed crystals, the formation of the crystals is favorably influencedin the molten syrup while a storing' of the separation is effected inthis crystallized mass.

The leading thought of this invention is based on the idea that onlylarge sized crystals are separated, small, and distilled unformedcrystals are led again for further growing, to the mixed molten-liquor,in a circulation under vacuum,

A complete emptying of the apparatus is done through the cock C.

What We claim is:

1. A process for the production of sugar or other crystals by subjectingthe sugar or like solution under vacuum influence to heat, and when byevaporation crystals are formed drawing off and straining the mass toseparate the larger crystals from the liquid and smaller crystals, againpassing the liquid and small crystals through the evaporating zone andthe straining operation as before, each step in the process being invacuo.

2. A process for the production of sugar or other crystals by subjectingthe sugar or like solution under vacuum influence to heat, and when byevaporation crystals are formed, adding more liquid, then drawing oiland straining the mass to separate the larger crystals from the liquidand smaller crystals, again passing the liquid and small 1 crystalsthrough the evaporating zone and the straining operation as before, allof the steps in the process being in vacuo.

' 3. Apparatus for working a process for the production of crystalscomprising a conveyer in said strainer, an outlet to re-.

ceive the fully formed crystals and means to connect with operativepower.

4. In apparatus for carrying out a process for granulating sugar andother substances a vacuum evaporator to hold the solution, valve guardedinlet and outlet ports in said evaporator, means for heating saidsolution,

a valued tube leading from the outlet of said evaporator to a forcepump, a strainer, a tube connecting said pump to said straine a conicalhelical conveyer in said strainer, means to remove the larger crystalsfrom the apparatus and means to force the mass of liquid and smallcrystals into said evapov rator again.

- In testimony whereof We afiix our signatures in the presence of twowitnesses.

OTTO FROMM. MATHIAS SCHODLY, lVitnesses WILHELM GRAEFE, JOHN WULF.

